Method of controlling the treatment of vegetable matter to obtain cellulose therefrom by manipulation of the vomit pipes



1,889,158 METHOD OF CONTROLLING THE TREATMENT OF VEGETABLE MATTER To OBTAIN Nov. 29, 1932. E. SPENCER CELLULOSE THEREFROM BY MANIPULATION OF THE VOMIT PIPES Filed March 20, 1929 2 Sheets-Sheet 1 Npv. 29, 1932. sp c 1,889,158 METHOD OF CONTROLLING THE TREATMENT OF VEGETABLE MATTER TO OBTAIN CELLULOSE THER EROM BY MANIPULATION OF THE VOMIT PIPES Filed March 20, 1929 2 Sheets-Sheet 2 I :wenor: Edmondlsow Q'pence r,

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" nethods, or analogous or similar methods, in

i. is inde of ee e bl val 1 g el op ed w en si hue-penmi n'g rt i gester isefieetively used to tqrce the liquid Patented Nov. 29, 1932 UNITED STATES PATENT nmonnson srnNGEB 0F CALCUTTA, mim sn INDIA, Ass enen 0F ol e-nets T9 EDWARD dHARLns BENTH'AIQIL,

METHOD 01a CONTROLLING THE TREATMENT on VEGETABLE -MAT'I-EB TO omen:

CELLULOSE THEBEFROM B Y MANIIITLA-TIQN OF THE wetter a iens Application filed March 20, 9, x el 2- ;fififii end in Ji ish me May 2 ,e e v eie mp ov d tre tm nt to be ri d 9 out.

Theinyention nelates to digestiqn pigoeesses which are carried ut in digesters f tted with nte n l v mi p pe nd more partieulet y t i reeee es pl y e e de dige i Whiqh the digestion is ear ried o ut in stagesor st ps in step down zp l f ti r ig ting iquo een e et e gre on- The PIEO3QQSSQS or treatment to :be described proeesses as describedin the specifications .of U. S. patents applications Serial Nos. 253,309, 253,310 01 253311, filed February 1Q, l928 althq igh it is to be understood that its use is not necessarily restrictedto applicationto-such process alone.

Ihe inventien concerns the provision of yalves in-the in enne v m t p p s used in h digesters, which valves In ay be closed off 91' advantages and improvements to bQlfQfLliZed in th gtiieet en R By the u seef suchyalvesit .is possible to arrange \that the head of pressure in a difrom: the fibre contained in fthe digester when transferring the liquor frein said ,digester ith ut the pressure releasing itself down the side ivginit pipes. If these voinitpi pes are left Lepen, Owing vto the pressure releas- 111g; down these v o lnit pipes in preference, to passing through the packed fibrous i mass: below, the disehar geof the liquor fr rn the digester is Emainly aeeolnplisheet :by the qr chnary; gravitationalflow ofthe hquor fto n the fibresend i :is terytd fi l {to elete e plete remeval ottheliqunr owing t o ceplllery e tneet n- "W hth v tpipe te e d t pressureghea d ismaintained in thetop. 9f the tligester it jfel ces the liquor clorwn through theyfibrmmoreeompletely. Assn example a, \digQStQIJ', fitted with these new .ee v s inaits".v mi tp peeeee 0 231 11 2? on ieee t hen the l u r wa .hlee off wi h th em e tee epe Wit the 'Ye i y' t eleee t e em ee e liqu r .eeet n in" t e ee e .efie blew es W a ee hee pe e lbl using the p ee -m n the d e e f W 1 5 5. 0 setlen'e- Tie .ee end t nte 9i I eee Wem pi e YelI- e i lle by E e e ih m-e i edieel y il z ie the d s l eheet e r i i e n m t e efie d by ,fe t he li 1 p h e g i t e fibr ei lii e ye i Ai h ed eete e Whieh iS leenneeted H th ehlQWiQg e er ii eliqter' e mi lte digester to another is that the liqndr Inayl ie fenced (up by the fn i e ee h ee 'ifi Wit the telvee le ed and ensu here g iei euletiet e vthe l quo "Wi i .eh efibre- .I th die' etieee Az eet bletme t -z 1 1eee e eel ui 'e meme ried w i e ee e eti th ei we e t i ii' Pi es,

th inventi n lee fle et W de y ,i .e ne 9 ine e i the fifiei e y o eeetei lpe 't' o steps n th t ee m r fiiwh e y et r i li ation of liquor in or i tr etns'feirfo f liqu r from n ve se to eneth rlmei e e t bi ellee sefi er e eeieg elit t ee weme p e as y be lejeel .eede it 'ie e th l qee t t keeee red e r ee e lat eeleei ied eieeeee ie lsle b tt eeetrol.

.Tlee iev ntie 1 e eeeme ie e n e (d ge ie -e t te lmette fe h @erp ee Te ree t eiee' th eellelee ee i d t re- Ein (gr :IEQI plsper n1al ing,.-0rf1ike purpbses) tintwhi hee; e j e tewi h intern vem ip ie'e is used, an impIOYQd nienneriof treetment which consists, lien the digestibn ,en the e e e e et p-ii th disee't e f f e digeetion is carried ntin stages or steps) is omp i e e iee" ee d vomi -Pipe he the' .Weste Qrilntp afnother dlgester end in utiliz- 111g the'steam 9r flitp qtli pressurev above the elique ne d:fi e ie te ite le e e i e the liquor, thi'Qtlghfihe .eellul'ose ,ore fibre uni e -le'ree men $1 11 etiY-eIY er ii r at p epl rt en e th li e ne th in then i e h twi p'ee bl ite 51 tee -vwithepen,Y -yiP e In the digestion of vegetable matter for recovering cellulose therefrom in which for efiiciency in loading, drenching down and circulating liquor in the digesters vomit pipes are used inside the digesters, and more particularly in digestion processes of the cascade type such as are disclosed in U. S. .A. patent Serial Nos. 258,309, 253,3l0 or 253,311 in which digesters such vomit pipes are used, the invention includes a manner of improvingthe blowing off or blowing over efliciency in transferring the liquid contents from one digester to another or from one digester to waste or to other desired destination using for that purpose the residual pressure in the digester to be'blown ofi or over, which consists in closing OK the vomit pipes and thus preventing release of steam or vapour pressure by way of said pipes from above the liquid surface of the contents of the digester when the valve at the bottom of the digester is opened thus ensuring that said steam or vapour pressure shall follow up and drive 7 open.

The invention also includes, in thedigestion of vegetable matter for recovering cellulose therefrom in digesters fitted with internal vomit pipes, a manner of improving the circulation during loading or digestion the vomit pipes in the digester into which the liquor is being forced for the purpose of forcing the incoming liquor up through the fibre contents of the said digester each time the said vomit pipes are closed.

It further includes a process of digestion of vegetable matter to isolate or extract the fibre or cellulose'therefrom according to any of the methods disclosed in U. S. A. patent Specifications Serial Nos. 253,309, 258,810 or 7 253,311 in which internal vomit pipes are used in the digesters and the efliciency is increased of the blowing, forclng'or pumping over from or blowing, forcing or pumping liquor into a digester by periodically, intermittently or when desired closing oil the vomit pipes for the pu-rposesexplained.

Finally, the invention includes apparatus for the digestion of vegetable matter to recover the cellulose therefrom, comprising one or more digesters with internal vomit pipes, characterized by having valves or other closing means whereby the said vomit pipes may be closed or opened when desired.

The invention will now be described with reference tothe accompanying drawings, in which Fig. l is a half elevation and half section of a Sinclair type of digester;

Fig. 2 is a cross section on line A A of Fig; 1; I

Figs. 3 and 4; are a vertical section and a plan on line B B of a valve.

Fig. 5 is an elevation, showing a plurality of the digesters, arranged in series relation.

In these figures which are only for illustration purposes the digester 1 has two semicircular vomit pipes 2, 2 leading from the space 4 belowthe grating 3 in the bottom of the digester to the space 10.

In each vomit pipe a valve or cut-01f 5 is fitted which may be worked by the spindle 6.

This valve 5 works in a slot through the vomit pipe and may close the same or leave it unobstructed. The hand wheel 7 operates the spindle 6 which passes through a suitable gland 8 and has a bearing in the bracket 9.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is 1. A process of digestion of vegetable mat ter in which a container is employed in which the'load is inserted and expelled from the top, together with internal vomit pipes extending substantially the entire length of the drum, and an opening for the digesting liquid in the bottom, comprising inserting the digesting liquid from the bottom and normally passing it through the vomit pipes to the top of the drum, and then showerin the digesting liquid through the load, an cutting off the flow of liquid through the vomit pipes when discharging the liquid, whereby the internal pressure in the drum substantially rids the load of its content by discharge through the said opening.

2. A process of digestion of vegetable matter employing a drum into which the load is inserted and expelled from the top and having internal vomit pipes, comprising inserting the digesting liquid from the bottom of the drum and passing it upwardly through the vomit pipes to the top portion of the drum, and then showering the liquid through the load, and periodically reverslng the flow of the liquid through the drum and vomit pipes, for ensuring intimate contact between the liquid and the load.

3. A process of digestion of vegetable matter employing a battery of digesters arranged in cascade, each digester comprising a drum having internal vomit pipes and into which the load is inserted and expelled from the top, comprising normally passing the digesting liquid in each drum from the bottom 5 thereof through the vomit pipes to the top portion of the drum, and then showering the liquid through the load, and cutting off the flow of liquid through the Vomit pipe in one of the digesters when the liquid from an- 19 other digester is being passed thereinto whereby the liquid is forced directly through the load to ensure intimate contact between the liquid and the load.

In testimony whereof I hereto affix my sig 5 nature, this Sthday of October, 1928.

EDMONDSON SPENCER. 

